move config validation into a separate function

extensions/frontend/pkg/config/parser/parse.go

@@ -29,5 +29,13 @@ func ParseConfig(cfg *config.Config) error {
 
 	defaults.Sanitize(cfg)
 
+	return Validate(cfg)
+}
+
+func Validate(cfg *config.Config) error {
+	if cfg.TransferSecret == "" {
+		return ftm.Errorf("reva transfer secret is not set up properly, bailing out (%s)", cfg.Service.Name)
+	}
+
 	return nil
 }